If understanding your initial question about that size tire already been in the computer, yes that could happen from the factory as it is stock for a Rubicon, you may not have a Rubicon but the factory has a 5% fudge factor on the speedo and probably does not adjust for every tire size
So i have a Tazer and unmarry for dealer visits , my wife wants a slight lift and new tires for her JL. I am thinking go with Jscan for tire size change for cost. My question is for dealer visits with Jscan you don't have to do anything prior to visit correct? If so I will probably sell my tazer...
Sounds like something in AC blower motor, google replacement and shows how to take it out and you can check, or could have even gone bad, sound would be more pronounced under passenger dash